Warning to All! - Everyone look at this!

Nomad and eDJ have good points. Well said both. If quality control becomes the end consumers' job then the jobs are created by these "crap shoot" motors and building them better due to the demand for higher quality. Imagine an American company that does only Asian two stroke upgrades and mods. The Japanese learned this, from simple transistor radios to Sony, Toyota to Lexus. We vote with our dollars and the producers want our vote.

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The only normal people are the ones you don't know very well.

Nomad got it. This guy was using a 79.oo bike trying to go 30 mph for sustained length of time. The bike was designed to go 12mph and that is just as fast as it should go. Anything above that is a gamble. The little happy engine is a helper engine for motor assist. we have fun making them run better than intended and then use discretion when riding, some through caution to the wind, but I think most know the safe speed for a 79.oo bike. And I think he over torqued the bolts, I still have the original ones after 3 years running. I say he did not have the chain adjusted correctly and it derailed and jerked the engine over and broke the motor studs, look at the L/H cover, and the wadded up chain. Have fun, Dave

PS: Happy Times forever, and put the pedals back on. Its not a motorcycle.

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Chuck - The monkey has the spark plug again!

When the engine mounts failed and the whole engine fell off the bike, the chain, after flying off the drive sprocket, took a large chunk right out of the side of the engine. This is what tells me that the whole thing is constructed of such low quality metal that there is no way to make them safe. Replace all the nuts and bolts you want, the whole thing is so cheesy, it could blow apart at any time. I'll stick to riding my Yamaha. Yes, I'm faced with all the dangers of the open road, and the thrills of cruising on two wheels, but at least I can feel comfortable that the machine I'm on is made of real metal.

how did you feel before the studs broke? when you was riding 30mph , were you enjoying yourself and your bike? I noticed you dont have any pedals but you have pegs; why? "the moment you live , you live for the moment" repair your chengine and get back on your horse instead of shooting it!

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I'll keep rollin "FileStyle"
"I'am just a penny short of being a millionaire"

Well maybe you're just not cut out to ride a motor bike with a chinese engine then and maybe you'll be better served on a Yamaha forum.

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Let the solution BE the revolution

G's!

These are chinese bicycle motor kits- strictly for novelty, unless you are one of hundreds to use them for daily transportation or even looong evening rides.

Stuff happens and it's not just because these are cheap chinese kits.

They ARE cheap chinese kits.

Fix your bike engine, rally against them to the govt' who doesn't care or listen, or pick up golf.

We get the message, your bike broke, you're PO'ed and life is short, freedom of choice and all that.

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If it ain't broke, and you mess with it long enough, it will be.

Is that where you put the bicycle sprocket, pedals and chain perhaps before the studs gave away under the strain of a no up to speed start? Sorry for your misfortune and am glad you're OK- you ought focus your ire at the mechanic who installed the faulty soft studs. Happier Future Trails Walter F.

Sorry to see this. Our decisions are always a gamble on 2 wheels, 4 wheels or flying. I try to engineer these possibilities out while building the thing. Thanks for the notice!

Thanks for the headsup. I'll keep all that in mind whilst building bike #3.........................

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Was I enjoying myself? Yes, I was. I understand, "You pays your money, you takes your chances", but there is a basic difference between something your life depends on, and other stuff. It's not like I bought a cheap quality Chinese made television for half the price of every other brand and now I'm hopping mad because it broke. The TV breaking down would not be endangering life and limb.
I removed the pedals because they serve so little purpose, that considering the additional weight and maintainance, they aren't worth keeping. Think about it. Everyone here says that the engine is powerful enough to take them up any hill they encounter, without the need for pedaling. Then, the only purpose they serve is starting the engine. I realized after a while, that 90% of the building and maintainance problems I was having involved chains and sprockets. You'll notice in the photos that there is no chain tensioner. That's not because it fell off along with the engine. It isn't necessary with only one chain. You can adjust the tension just fine without it, if that's the only chain. So, consider that you have removed the tensioner, a chain, pedals, crankset, lever, cable, and shifting mechanism, and you see that you have made the whole thing lighter, simpler, and a heck of a lot easier to maintain. I've been starting the bike just by rolling it along, jumping on, and popping the clutch lever; no problem.
I agree that these things should be consider nothing more than bicycles, with helper motors for hills. However, everyone who inquires about them has the same first question; how fast will it go. If I tell them that it isn't meant to go any faster than they could pedal the bike anyway, I'm not likely to sell many of them.